drivers/target/target_core_cdb.c

   1 /*
   2  * CDB emulation for non-READ/WRITE commands.
   3  *
   4  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   5  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   6  * Copyright (c) 2007-2010 Rising Tide Systems
   7  * Copyright (c) 2008-2010 Linux-iSCSI.org
   8  *
   9  * Nicholas A. Bellinger <nab@kernel.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  */
  25
  26 #include <asm/unaligned.h>
  27 #include <scsi/scsi.h>
  28
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_transport.h>
  31 #include <target/target_core_fabric_ops.h>
  32 #include "target_core_ua.h"
  33
  34 static void
  35 target_fill_alua_data(struct se_port *port, unsigned char *buf)
  36 {
  37         struct t10_alua_tg_pt_gp *tg_pt_gp;
  38         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  39
  40         /*
  41          * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
  42          */
  43         buf[5]  = 0x80;
  44
  45         /*
  46          * Set TPGS field for explict and/or implict ALUA access type
  47          * and opteration.
  48          *
  49          * See spc4r17 section 6.4.2 Table 135
  50          */
  51         if (!port)
  52                 return;
  53         tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
  54         if (!tg_pt_gp_mem)
  55                 return;
  56
  57         spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  58         tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
  59         if (tg_pt_gp)
  60                 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
  61         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  62 }
  63
  64 static int
  65 target_emulate_inquiry_std(struct se_cmd *cmd)
  66 {
  67         struct se_lun *lun = cmd->se_lun;
  68         struct se_device *dev = cmd->se_dev;
  69         unsigned char *buf;
  70
  71         /*
  72          * Make sure we at least have 6 bytes of INQUIRY response
  73          * payload going back for EVPD=0
  74          */
  75         if (cmd->data_length < 6) {
  76                 printk(KERN_ERR "SCSI Inquiry payload length: %u"
  77                         " too small for EVPD=0\n", cmd->data_length);
  78                 return -EINVAL;
  79         }
  80
  81         buf = transport_kmap_first_data_page(cmd);
  82
  83         buf[0] = dev->transport->get_device_type(dev);
  84         if (buf[0] == TYPE_TAPE)
  85                 buf[1] = 0x80;
  86         buf[2] = dev->transport->get_device_rev(dev);
  87
  88         /*
  89          * Enable SCCS and TPGS fields for Emulated ALUA
  90          */
  91         if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED)
  92                 target_fill_alua_data(lun->lun_sep, buf);
  93
  94         if (cmd->data_length < 8) {
  95                 buf[4] = 1; /* Set additional length to 1 */
  96                 goto out;
  97         }
  98
  99         buf[7] = 0x32; /* Sync=1 and CmdQue=1 */
 100
 101         /*
 102          * Do not include vendor, product, reversion info in INQUIRY
 103          * response payload for cdbs with a small allocation length.
 104          */
 105         if (cmd->data_length < 36) {
 106                 buf[4] = 3; /* Set additional length to 3 */
 107                 goto out;
 108         }
 109
 110         snprintf((unsigned char *)&buf[8], 8, "LIO-ORG");
 111         snprintf((unsigned char *)&buf[16], 16, "%s",
 112                  &dev->se_sub_dev->t10_wwn.model[0]);
 113         snprintf((unsigned char *)&buf[32], 4, "%s",
 114                  &dev->se_sub_dev->t10_wwn.revision[0]);
 115         buf[4] = 31; /* Set additional length to 31 */
 116
 117 out:
 118         transport_kunmap_first_data_page(cmd);
 119         return 0;
 120 }
 121
 122 /* unit serial number */
 123 static int
 124 target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
 125 {
 126         struct se_device *dev = cmd->se_dev;
 127         u16 len = 0;
 128
 129         if (dev->se_sub_dev->su_dev_flags &
 130                         SDF_EMULATED_VPD_UNIT_SERIAL) {
 131                 u32 unit_serial_len;
 132
 133                 unit_serial_len =
 134                         strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
 135                 unit_serial_len++; /* For NULL Terminator */
 136
 137                 if (((len + 4) + unit_serial_len) > cmd->data_length) {
 138                         len += unit_serial_len;
 139                         buf[2] = ((len >> 8) & 0xff);
 140                         buf[3] = (len & 0xff);
 141                         return 0;
 142                 }
 143                 len += sprintf((unsigned char *)&buf[4], "%s",
 144                         &dev->se_sub_dev->t10_wwn.unit_serial[0]);
 145                 len++; /* Extra Byte for NULL Terminator */
 146                 buf[3] = len;
 147         }
 148         return 0;
 149 }
 150
 151 /*
 152  * Device identification VPD, for a complete list of
 153  * DESIGNATOR TYPEs see spc4r17 Table 459.
 154  */
 155 static int
 156 target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
 157 {
 158         struct se_device *dev = cmd->se_dev;
 159         struct se_lun *lun = cmd->se_lun;
 160         struct se_port *port = NULL;
 161         struct se_portal_group *tpg = NULL;
 162         struct t10_alua_lu_gp_member *lu_gp_mem;
 163         struct t10_alua_tg_pt_gp *tg_pt_gp;
 164         struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 165         unsigned char binary, binary_new;
 166         unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0];
 167         u32 prod_len;
 168         u32 unit_serial_len, off = 0;
 169         int i;
 170         u16 len = 0, id_len;
 171
 172         off = 4;
 173
 174         /*
 175          * NAA IEEE Registered Extended Assigned designator format, see
 176          * spc4r17 section 7.7.3.6.5
 177          *
 178          * We depend upon a target_core_mod/ConfigFS provided
 179          * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
 180          * value in order to return the NAA id.
 181          */
 182         if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL))
 183                 goto check_t10_vend_desc;
 184
 185         if (off + 20 > cmd->data_length)
 186                 goto check_t10_vend_desc;
 187
 188         /* CODE SET == Binary */
 189         buf[off++] = 0x1;
 190
 191         /* Set ASSOICATION == addressed logical unit: 0)b */
 192         buf[off] = 0x00;
 193
 194         /* Identifier/Designator type == NAA identifier */
 195         buf[off++] = 0x3;
 196         off++;
 197
 198         /* Identifier/Designator length */
 199         buf[off++] = 0x10;
 200
 201         /*
 202          * Start NAA IEEE Registered Extended Identifier/Designator
 203          */
 204         buf[off++] = (0x6 << 4);
 205
 206         /*
 207          * Use OpenFabrics IEEE Company ID: 00 14 05
 208          */
 209         buf[off++] = 0x01;
 210         buf[off++] = 0x40;
 211         buf[off] = (0x5 << 4);
 212
 213         /*
 214          * Return ConfigFS Unit Serial Number information for
 215          * VENDOR_SPECIFIC_IDENTIFIER and
 216          * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
 217          */
 218         binary = transport_asciihex_to_binaryhex(
 219                                 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
 220         buf[off++] |= (binary & 0xf0) >> 4;
 221         for (i = 0; i < 24; i += 2) {
 222                 binary_new = transport_asciihex_to_binaryhex(
 223                         &dev->se_sub_dev->t10_wwn.unit_serial[i+2]);
 224                 buf[off] = (binary & 0x0f) << 4;
 225                 buf[off++] |= (binary_new & 0xf0) >> 4;
 226                 binary = binary_new;
 227         }
 228         len = 20;
 229         off = (len + 4);
 230
 231 check_t10_vend_desc:
 232         /*
 233          * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
 234          */
 235         id_len = 8; /* For Vendor field */
 236         prod_len = 4; /* For VPD Header */
 237         prod_len += 8; /* For Vendor field */
 238         prod_len += strlen(prod);
 239         prod_len++; /* For : */
 240
 241         if (dev->se_sub_dev->su_dev_flags &
 242                         SDF_EMULATED_VPD_UNIT_SERIAL) {
 243                 unit_serial_len =
 244                         strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]);
 245                 unit_serial_len++; /* For NULL Terminator */
 246
 247                 if ((len + (id_len + 4) +
 248                     (prod_len + unit_serial_len)) >
 249                                 cmd->data_length) {
 250                         len += (prod_len + unit_serial_len);
 251                         goto check_port;
 252                 }
 253                 id_len += sprintf((unsigned char *)&buf[off+12],
 254                                 "%s:%s", prod,
 255                                 &dev->se_sub_dev->t10_wwn.unit_serial[0]);
 256         }
 257         buf[off] = 0x2; /* ASCII */
 258         buf[off+1] = 0x1; /* T10 Vendor ID */
 259         buf[off+2] = 0x0;
 260         memcpy((unsigned char *)&buf[off+4], "LIO-ORG", 8);
 261         /* Extra Byte for NULL Terminator */
 262         id_len++;
 263         /* Identifier Length */
 264         buf[off+3] = id_len;
 265         /* Header size for Designation descriptor */
 266         len += (id_len + 4);
 267         off += (id_len + 4);
 268         /*
 269          * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
 270          */
 271 check_port:
 272         port = lun->lun_sep;
 273         if (port) {
 274                 struct t10_alua_lu_gp *lu_gp;
 275                 u32 padding, scsi_name_len;
 276                 u16 lu_gp_id = 0;
 277                 u16 tg_pt_gp_id = 0;
 278                 u16 tpgt;
 279
 280                 tpg = port->sep_tpg;
 281                 /*
 282                  * Relative target port identifer, see spc4r17
 283                  * section 7.7.3.7
 284                  *
 285                  * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 286                  * section 7.5.1 Table 362
 287                  */
 288                 if (((len + 4) + 8) > cmd->data_length) {
 289                         len += 8;
 290                         goto check_tpgi;
 291                 }
 292                 buf[off] =
 293                         (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
 294                 buf[off++] |= 0x1; /* CODE SET == Binary */
 295                 buf[off] = 0x80; /* Set PIV=1 */
 296                 /* Set ASSOICATION == target port: 01b */
 297                 buf[off] |= 0x10;
 298                 /* DESIGNATOR TYPE == Relative target port identifer */
 299                 buf[off++] |= 0x4;
 300                 off++; /* Skip over Reserved */
 301                 buf[off++] = 4; /* DESIGNATOR LENGTH */
 302                 /* Skip over Obsolete field in RTPI payload
 303                  * in Table 472 */
 304                 off += 2;
 305                 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
 306                 buf[off++] = (port->sep_rtpi & 0xff);
 307                 len += 8; /* Header size + Designation descriptor */
 308                 /*
 309                  * Target port group identifier, see spc4r17
 310                  * section 7.7.3.8
 311                  *
 312                  * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 313                  * section 7.5.1 Table 362
 314                  */
 315 check_tpgi:
 316                 if (dev->se_sub_dev->t10_alua.alua_type !=
 317                                 SPC3_ALUA_EMULATED)
 318                         goto check_scsi_name;
 319
 320                 if (((len + 4) + 8) > cmd->data_length) {
 321                         len += 8;
 322                         goto check_lu_gp;
 323                 }
 324                 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 325                 if (!tg_pt_gp_mem)
 326                         goto check_lu_gp;
 327
 328                 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 329                 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 330                 if (!(tg_pt_gp)) {
 331                         spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 332                         goto check_lu_gp;
 333                 }
 334                 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
 335                 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 336
 337                 buf[off] =
 338                         (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
 339                 buf[off++] |= 0x1; /* CODE SET == Binary */
 340                 buf[off] = 0x80; /* Set PIV=1 */
 341                 /* Set ASSOICATION == target port: 01b */
 342                 buf[off] |= 0x10;
 343                 /* DESIGNATOR TYPE == Target port group identifier */
 344                 buf[off++] |= 0x5;
 345                 off++; /* Skip over Reserved */
 346                 buf[off++] = 4; /* DESIGNATOR LENGTH */
 347                 off += 2; /* Skip over Reserved Field */
 348                 buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
 349                 buf[off++] = (tg_pt_gp_id & 0xff);
 350                 len += 8; /* Header size + Designation descriptor */
 351                 /*
 352                  * Logical Unit Group identifier, see spc4r17
 353                  * section 7.7.3.8
 354                  */
 355 check_lu_gp:
 356                 if (((len + 4) + 8) > cmd->data_length) {
 357                         len += 8;
 358                         goto check_scsi_name;
 359                 }
 360                 lu_gp_mem = dev->dev_alua_lu_gp_mem;
 361                 if (!(lu_gp_mem))
 362                         goto check_scsi_name;
 363
 364                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
 365                 lu_gp = lu_gp_mem->lu_gp;
 366                 if (!(lu_gp)) {
 367                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 368                         goto check_scsi_name;
 369                 }
 370                 lu_gp_id = lu_gp->lu_gp_id;
 371                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 372
 373                 buf[off++] |= 0x1; /* CODE SET == Binary */
 374                 /* DESIGNATOR TYPE == Logical Unit Group identifier */
 375                 buf[off++] |= 0x6;
 376                 off++; /* Skip over Reserved */
 377                 buf[off++] = 4; /* DESIGNATOR LENGTH */
 378                 off += 2; /* Skip over Reserved Field */
 379                 buf[off++] = ((lu_gp_id >> 8) & 0xff);
 380                 buf[off++] = (lu_gp_id & 0xff);
 381                 len += 8; /* Header size + Designation descriptor */
 382                 /*
 383                  * SCSI name string designator, see spc4r17
 384                  * section 7.7.3.11
 385                  *
 386                  * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 387                  * section 7.5.1 Table 362
 388                  */
 389 check_scsi_name:
 390                 scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 391                 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
 392                 scsi_name_len += 10;
 393                 /* Check for 4-byte padding */
 394                 padding = ((-scsi_name_len) & 3);
 395                 if (padding != 0)
 396                         scsi_name_len += padding;
 397                 /* Header size + Designation descriptor */
 398                 scsi_name_len += 4;
 399
 400                 if (((len + 4) + scsi_name_len) > cmd->data_length) {
 401                         len += scsi_name_len;
 402                         goto set_len;
 403                 }
 404                 buf[off] =
 405                         (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
 406                 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
 407                 buf[off] = 0x80; /* Set PIV=1 */
 408                 /* Set ASSOICATION == target port: 01b */
 409                 buf[off] |= 0x10;
 410                 /* DESIGNATOR TYPE == SCSI name string */
 411                 buf[off++] |= 0x8;
 412                 off += 2; /* Skip over Reserved and length */
 413                 /*
 414                  * SCSI name string identifer containing, $FABRIC_MOD
 415                  * dependent information.  For LIO-Target and iSCSI
 416                  * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
 417                  * UTF-8 encoding.
 418                  */
 419                 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 420                 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
 421                                         tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
 422                 scsi_name_len += 1 /* Include  NULL terminator */;
 423                 /*
 424                  * The null-terminated, null-padded (see 4.4.2) SCSI
 425                  * NAME STRING field contains a UTF-8 format string.
 426                  * The number of bytes in the SCSI NAME STRING field
 427                  * (i.e., the value in the DESIGNATOR LENGTH field)
 428                  * shall be no larger than 256 and shall be a multiple
 429                  * of four.
 430                  */
 431                 if (padding)
 432                         scsi_name_len += padding;
 433
 434                 buf[off-1] = scsi_name_len;
 435                 off += scsi_name_len;
 436                 /* Header size + Designation descriptor */
 437                 len += (scsi_name_len + 4);
 438         }
 439 set_len:
 440         buf[2] = ((len >> 8) & 0xff);
 441         buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
 442         return 0;
 443 }
 444
 445 /* Extended INQUIRY Data VPD Page */
 446 static int
 447 target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
 448 {
 449         if (cmd->data_length < 60)
 450                 return 0;
 451
 452         buf[2] = 0x3c;
 453         /* Set HEADSUP, ORDSUP, SIMPSUP */
 454         buf[5] = 0x07;
 455
 456         /* If WriteCache emulation is enabled, set V_SUP */
 457         if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
 458                 buf[6] = 0x01;
 459         return 0;
 460 }
 461
 462 /* Block Limits VPD page */
 463 static int
 464 target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 465 {
 466         struct se_device *dev = cmd->se_dev;
 467         int have_tp = 0;
 468
 469         /*
 470          * Following sbc3r22 section 6.5.3 Block Limits VPD page, when
 471          * emulate_tpu=1 or emulate_tpws=1 we will be expect a
 472          * different page length for Thin Provisioning.
 473          */
 474         if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
 475                 have_tp = 1;
 476
 477         if (cmd->data_length < (0x10 + 4)) {
 478                 printk(KERN_INFO "Received data_length: %u"
 479                         " too small for EVPD 0xb0\n",
 480                         cmd->data_length);
 481                 return -EINVAL;
 482         }
 483
 484         if (have_tp && cmd->data_length < (0x3c + 4)) {
 485                 printk(KERN_INFO "Received data_length: %u"
 486                         " too small for TPE=1 EVPD 0xb0\n",
 487                         cmd->data_length);
 488                 have_tp = 0;
 489         }
 490
 491         buf[0] = dev->transport->get_device_type(dev);
 492         buf[3] = have_tp ? 0x3c : 0x10;
 493
 494         /*
 495          * Set OPTIMAL TRANSFER LENGTH GRANULARITY
 496          */
 497         put_unaligned_be16(1, &buf[6]);
 498
 499         /*
 500          * Set MAXIMUM TRANSFER LENGTH
 501          */
 502         put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_sectors, &buf[8]);
 503
 504         /*
 505          * Set OPTIMAL TRANSFER LENGTH
 506          */
 507         put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]);
 508
 509         /*
 510          * Exit now if we don't support TP or the initiator sent a too
 511          * short buffer.
 512          */
 513         if (!have_tp || cmd->data_length < (0x3c + 4))
 514                 return 0;
 515
 516         /*
 517          * Set MAXIMUM UNMAP LBA COUNT
 518          */
 519         put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]);
 520
 521         /*
 522          * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
 523          */
 524         put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count,
 525                            &buf[24]);
 526
 527         /*
 528          * Set OPTIMAL UNMAP GRANULARITY
 529          */
 530         put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]);
 531
 532         /*
 533          * UNMAP GRANULARITY ALIGNMENT
 534          */
 535         put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment,
 536                            &buf[32]);
 537         if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0)
 538                 buf[32] |= 0x80; /* Set the UGAVALID bit */
 539
 540         return 0;
 541 }
 542
 543 /* Block Device Characteristics VPD page */
 544 static int
 545 target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
 546 {
 547         struct se_device *dev = cmd->se_dev;
 548
 549         buf[0] = dev->transport->get_device_type(dev);
 550         buf[3] = 0x3c;
 551
 552         if (cmd->data_length >= 5 &&
 553             dev->se_sub_dev->se_dev_attrib.is_nonrot)
 554                 buf[5] = 1;
 555
 556         return 0;
 557 }
 558
 559 /* Thin Provisioning VPD */
 560 static int
 561 target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
 562 {
 563         struct se_device *dev = cmd->se_dev;
 564
 565         /*
 566          * From sbc3r22 section 6.5.4 Thin Provisioning VPD page:
 567          *
 568          * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
 569          * zero, then the page length shall be set to 0004h.  If the DP bit
 570          * is set to one, then the page length shall be set to the value
 571          * defined in table 162.
 572          */
 573         buf[0] = dev->transport->get_device_type(dev);
 574
 575         /*
 576          * Set Hardcoded length mentioned above for DP=0
 577          */
 578         put_unaligned_be16(0x0004, &buf[2]);
 579
 580         /*
 581          * The THRESHOLD EXPONENT field indicates the threshold set size in
 582          * LBAs as a power of 2 (i.e., the threshold set size is equal to
 583          * 2(threshold exponent)).
 584          *
 585          * Note that this is currently set to 0x00 as mkp says it will be
 586          * changing again.  We can enable this once it has settled in T10
 587          * and is actually used by Linux/SCSI ML code.
 588          */
 589         buf[4] = 0x00;
 590
 591         /*
 592          * A TPU bit set to one indicates that the device server supports
 593          * the UNMAP command (see 5.25). A TPU bit set to zero indicates
 594          * that the device server does not support the UNMAP command.
 595          */
 596         if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0)
 597                 buf[5] = 0x80;
 598
 599         /*
 600          * A TPWS bit set to one indicates that the device server supports
 601          * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
 602          * A TPWS bit set to zero indicates that the device server does not
 603          * support the use of the WRITE SAME (16) command to unmap LBAs.
 604          */
 605         if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0)
 606                 buf[5] |= 0x40;
 607
 608         return 0;
 609 }
 610
 611 static int
 612 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
 613
 614 static struct {
 615         uint8_t         page;
 616         int             (*emulate)(struct se_cmd *, unsigned char *);
 617 } evpd_handlers[] = {
 618         { .page = 0x00, .emulate = target_emulate_evpd_00 },
 619         { .page = 0x80, .emulate = target_emulate_evpd_80 },
 620         { .page = 0x83, .emulate = target_emulate_evpd_83 },
 621         { .page = 0x86, .emulate = target_emulate_evpd_86 },
 622         { .page = 0xb0, .emulate = target_emulate_evpd_b0 },
 623         { .page = 0xb1, .emulate = target_emulate_evpd_b1 },
 624         { .page = 0xb2, .emulate = target_emulate_evpd_b2 },
 625 };
 626
 627 /* supported vital product data pages */
 628 static int
 629 target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
 630 {
 631         int p;
 632
 633         if (cmd->data_length < 8)
 634                 return 0;
 635         /*
 636          * Only report the INQUIRY EVPD=1 pages after a valid NAA
 637          * Registered Extended LUN WWN has been set via ConfigFS
 638          * during device creation/restart.
 639          */
 640         if (cmd->se_dev->se_sub_dev->su_dev_flags &
 641                         SDF_EMULATED_VPD_UNIT_SERIAL) {
 642                 buf[3] = ARRAY_SIZE(evpd_handlers);
 643                 for (p = 0; p < min_t(int, ARRAY_SIZE(evpd_handlers),
 644                                       cmd->data_length - 4); ++p)
 645                         buf[p + 4] = evpd_handlers[p].page;
 646         }
 647
 648         return 0;
 649 }
 650
 651 static int
 652 target_emulate_inquiry(struct se_cmd *cmd)
 653 {
 654         struct se_device *dev = cmd->se_dev;
 655         unsigned char *buf;
 656         unsigned char *cdb = cmd->t_task_cdb;
 657         int p, ret;
 658
 659         if (!(cdb[1] & 0x1))
 660                 return target_emulate_inquiry_std(cmd);
 661
 662         /*
 663          * Make sure we at least have 4 bytes of INQUIRY response
 664          * payload for 0x00 going back for EVPD=1.  Note that 0x80
 665          * and 0x83 will check for enough payload data length and
 666          * jump to set_len: label when there is not enough inquiry EVPD
 667          * payload length left for the next outgoing EVPD metadata
 668          */
 669         if (cmd->data_length < 4) {
 670                 printk(KERN_ERR "SCSI Inquiry payload length: %u"
 671                         " too small for EVPD=1\n", cmd->data_length);
 672                 return -EINVAL;
 673         }
 674
 675         buf = transport_kmap_first_data_page(cmd);
 676
 677         buf[0] = dev->transport->get_device_type(dev);
 678
 679         for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
 680                 if (cdb[2] == evpd_handlers[p].page) {
 681                         buf[1] = cdb[2];
 682                         ret = evpd_handlers[p].emulate(cmd, buf);
 683                         transport_kunmap_first_data_page(cmd);
 684                         return ret;
 685                 }
 686
 687         transport_kunmap_first_data_page(cmd);
 688         printk(KERN_ERR "Unknown VPD Code: 0x%02x\n", cdb[2]);
 689         return -EINVAL;
 690 }
 691
 692 static int
 693 target_emulate_readcapacity(struct se_cmd *cmd)
 694 {
 695         struct se_device *dev = cmd->se_dev;
 696         unsigned char *buf;
 697         unsigned long long blocks_long = dev->transport->get_blocks(dev);
 698         u32 blocks;
 699
 700         if (blocks_long >= 0x00000000ffffffff)
 701                 blocks = 0xffffffff;
 702         else
 703                 blocks = (u32)blocks_long;
 704
 705         buf = transport_kmap_first_data_page(cmd);
 706
 707         buf[0] = (blocks >> 24) & 0xff;
 708         buf[1] = (blocks >> 16) & 0xff;
 709         buf[2] = (blocks >> 8) & 0xff;
 710         buf[3] = blocks & 0xff;
 711         buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
 712         buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
 713         buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
 714         buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
 715         /*
 716          * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16
 717         */
 718         if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
 719                 put_unaligned_be32(0xFFFFFFFF, &buf[0]);
 720
 721         transport_kunmap_first_data_page(cmd);
 722
 723         return 0;
 724 }
 725
 726 static int
 727 target_emulate_readcapacity_16(struct se_cmd *cmd)
 728 {
 729         struct se_device *dev = cmd->se_dev;
 730         unsigned char *buf;
 731         unsigned long long blocks = dev->transport->get_blocks(dev);
 732
 733         buf = transport_kmap_first_data_page(cmd);
 734
 735         buf[0] = (blocks >> 56) & 0xff;
 736         buf[1] = (blocks >> 48) & 0xff;
 737         buf[2] = (blocks >> 40) & 0xff;
 738         buf[3] = (blocks >> 32) & 0xff;
 739         buf[4] = (blocks >> 24) & 0xff;
 740         buf[5] = (blocks >> 16) & 0xff;
 741         buf[6] = (blocks >> 8) & 0xff;
 742         buf[7] = blocks & 0xff;
 743         buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff;
 744         buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff;
 745         buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
 746         buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
 747         /*
 748          * Set Thin Provisioning Enable bit following sbc3r22 in section
 749          * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
 750          */
 751         if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
 752                 buf[14] = 0x80;
 753
 754         transport_kunmap_first_data_page(cmd);
 755
 756         return 0;
 757 }
 758
 759 static int
 760 target_modesense_rwrecovery(unsigned char *p)
 761 {
 762         p[0] = 0x01;
 763         p[1] = 0x0a;
 764
 765         return 12;
 766 }
 767
 768 static int
 769 target_modesense_control(struct se_device *dev, unsigned char *p)
 770 {
 771         p[0] = 0x0a;
 772         p[1] = 0x0a;
 773         p[2] = 2;
 774         /*
 775          * From spc4r17, section 7.4.6 Control mode Page
 776          *
 777          * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
 778          *
 779          * 00b: The logical unit shall clear any unit attention condition
 780          * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 781          * status and shall not establish a unit attention condition when a com-
 782          * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
 783          * status.
 784          *
 785          * 10b: The logical unit shall not clear any unit attention condition
 786          * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 787          * status and shall not establish a unit attention condition when
 788          * a command is completed with BUSY, TASK SET FULL, or RESERVATION
 789          * CONFLICT status.
 790          *
 791          * 11b a The logical unit shall not clear any unit attention condition
 792          * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 793          * status and shall establish a unit attention condition for the
 794          * initiator port associated with the I_T nexus on which the BUSY,
 795          * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
 796          * Depending on the status, the additional sense code shall be set to
 797          * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
 798          * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
 799          * command, a unit attention condition shall be established only once
 800          * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
 801          * to the number of commands completed with one of those status codes.
 802          */
 803         p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
 804                (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
 805         /*
 806          * From spc4r17, section 7.4.6 Control mode Page
 807          *
 808          * Task Aborted Status (TAS) bit set to zero.
 809          *
 810          * A task aborted status (TAS) bit set to zero specifies that aborted
 811          * tasks shall be terminated by the device server without any response
 812          * to the application client. A TAS bit set to one specifies that tasks
 813          * aborted by the actions of an I_T nexus other than the I_T nexus on
 814          * which the command was received shall be completed with TASK ABORTED
 815          * status (see SAM-4).
 816          */
 817         p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00;
 818         p[8] = 0xff;
 819         p[9] = 0xff;
 820         p[11] = 30;
 821
 822         return 12;
 823 }
 824
 825 static int
 826 target_modesense_caching(struct se_device *dev, unsigned char *p)
 827 {
 828         p[0] = 0x08;
 829         p[1] = 0x12;
 830         if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0)
 831                 p[2] = 0x04; /* Write Cache Enable */
 832         p[12] = 0x20; /* Disabled Read Ahead */
 833
 834         return 20;
 835 }
 836
 837 static void
 838 target_modesense_write_protect(unsigned char *buf, int type)
 839 {
 840         /*
 841          * I believe that the WP bit (bit 7) in the mode header is the same for
 842          * all device types..
 843          */
 844         switch (type) {
 845         case TYPE_DISK:
 846         case TYPE_TAPE:
 847         default:
 848                 buf[0] |= 0x80; /* WP bit */
 849                 break;
 850         }
 851 }
 852
 853 static void
 854 target_modesense_dpofua(unsigned char *buf, int type)
 855 {
 856         switch (type) {
 857         case TYPE_DISK:
 858                 buf[0] |= 0x10; /* DPOFUA bit */
 859                 break;
 860         default:
 861                 break;
 862         }
 863 }
 864
 865 static int
 866 target_emulate_modesense(struct se_cmd *cmd, int ten)
 867 {
 868         struct se_device *dev = cmd->se_dev;
 869         char *cdb = cmd->t_task_cdb;
 870         unsigned char *rbuf;
 871         int type = dev->transport->get_device_type(dev);
 872         int offset = (ten) ? 8 : 4;
 873         int length = 0;
 874         unsigned char buf[SE_MODE_PAGE_BUF];
 875
 876         memset(buf, 0, SE_MODE_PAGE_BUF);
 877
 878         switch (cdb[2] & 0x3f) {
 879         case 0x01:
 880                 length = target_modesense_rwrecovery(&buf[offset]);
 881                 break;
 882         case 0x08:
 883                 length = target_modesense_caching(dev, &buf[offset]);
 884                 break;
 885         case 0x0a:
 886                 length = target_modesense_control(dev, &buf[offset]);
 887                 break;
 888         case 0x3f:
 889                 length = target_modesense_rwrecovery(&buf[offset]);
 890                 length += target_modesense_caching(dev, &buf[offset+length]);
 891                 length += target_modesense_control(dev, &buf[offset+length]);
 892                 break;
 893         default:
 894                 printk(KERN_ERR "Got Unknown Mode Page: 0x%02x\n",
 895                                 cdb[2] & 0x3f);
 896                 return PYX_TRANSPORT_UNKNOWN_MODE_PAGE;
 897         }
 898         offset += length;
 899
 900         if (ten) {
 901                 offset -= 2;
 902                 buf[0] = (offset >> 8) & 0xff;
 903                 buf[1] = offset & 0xff;
 904
 905                 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
 906                     (cmd->se_deve &&
 907                     (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
 908                         target_modesense_write_protect(&buf[3], type);
 909
 910                 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
 911                     (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
 912                         target_modesense_dpofua(&buf[3], type);
 913
 914                 if ((offset + 2) > cmd->data_length)
 915                         offset = cmd->data_length;
 916
 917         } else {
 918                 offset -= 1;
 919                 buf[0] = offset & 0xff;
 920
 921                 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
 922                     (cmd->se_deve &&
 923                     (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
 924                         target_modesense_write_protect(&buf[2], type);
 925
 926                 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) &&
 927                     (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0))
 928                         target_modesense_dpofua(&buf[2], type);
 929
 930                 if ((offset + 1) > cmd->data_length)
 931                         offset = cmd->data_length;
 932         }
 933
 934         rbuf = transport_kmap_first_data_page(cmd);
 935         memcpy(rbuf, buf, offset);
 936         transport_kunmap_first_data_page(cmd);
 937
 938         return 0;
 939 }
 940
 941 static int
 942 target_emulate_request_sense(struct se_cmd *cmd)
 943 {
 944         unsigned char *cdb = cmd->t_task_cdb;
 945         unsigned char *buf;
 946         u8 ua_asc = 0, ua_ascq = 0;
 947         int err = 0;
 948
 949         if (cdb[1] & 0x01) {
 950                 printk(KERN_ERR "REQUEST_SENSE description emulation not"
 951                         " supported\n");
 952                 return PYX_TRANSPORT_INVALID_CDB_FIELD;
 953         }
 954
 955         buf = transport_kmap_first_data_page(cmd);
 956
 957         if (!(core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))) {
 958                 /*
 959                  * CURRENT ERROR, UNIT ATTENTION
 960                  */
 961                 buf[0] = 0x70;
 962                 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
 963                 /*
 964                  * Make sure request data length is enough for additional
 965                  * sense data.
 966                  */
 967                 if (cmd->data_length <= 18) {
 968                         buf[7] = 0x00;
 969                         err = -EINVAL;
 970                         goto end;
 971                 }
 972                 /*
 973                  * The Additional Sense Code (ASC) from the UNIT ATTENTION
 974                  */
 975                 buf[SPC_ASC_KEY_OFFSET] = ua_asc;
 976                 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
 977                 buf[7] = 0x0A;
 978         } else {
 979                 /*
 980                  * CURRENT ERROR, NO SENSE
 981                  */
 982                 buf[0] = 0x70;
 983                 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
 984                 /*
 985                  * Make sure request data length is enough for additional
 986                  * sense data.
 987                  */
 988                 if (cmd->data_length <= 18) {
 989                         buf[7] = 0x00;
 990                         err = -EINVAL;
 991                         goto end;
 992                 }
 993                 /*
 994                  * NO ADDITIONAL SENSE INFORMATION
 995                  */
 996                 buf[SPC_ASC_KEY_OFFSET] = 0x00;
 997                 buf[7] = 0x0A;
 998         }
 999
1000 end:
1001         transport_kunmap_first_data_page(cmd);
1002
1003         return 0;
1004 }
1005
1006 /*
1007  * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1008  * Note this is not used for TCM/pSCSI passthrough
1009  */
1010 static int
1011 target_emulate_unmap(struct se_task *task)
1012 {
1013         struct se_cmd *cmd = task->task_se_cmd;
1014         struct se_device *dev = cmd->se_dev;
1015         unsigned char *buf, *ptr = NULL;
1016         unsigned char *cdb = &cmd->t_task_cdb[0];
1017         sector_t lba;
1018         unsigned int size = cmd->data_length, range;
1019         int ret = 0, offset;
1020         unsigned short dl, bd_dl;
1021
1022         /* First UNMAP block descriptor starts at 8 byte offset */
1023         offset = 8;
1024         size -= 8;
1025         dl = get_unaligned_be16(&cdb[0]);
1026         bd_dl = get_unaligned_be16(&cdb[2]);
1027
1028         buf = transport_kmap_first_data_page(cmd);
1029
1030         ptr = &buf[offset];
1031         printk(KERN_INFO "UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
1032                 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1033
1034         while (size) {
1035                 lba = get_unaligned_be64(&ptr[0]);
1036                 range = get_unaligned_be32(&ptr[8]);
1037                 printk(KERN_INFO "UNMAP: Using lba: %llu and range: %u\n",
1038                                  (unsigned long long)lba, range);
1039
1040                 ret = dev->transport->do_discard(dev, lba, range);
1041                 if (ret < 0) {
1042                         printk(KERN_ERR "blkdev_issue_discard() failed: %d\n",
1043                                         ret);
1044                         goto err;
1045                 }
1046
1047                 ptr += 16;
1048                 size -= 16;
1049         }
1050
1051         task->task_scsi_status = GOOD;
1052         transport_complete_task(task, 1);
1053 err:
1054         transport_kunmap_first_data_page(cmd);
1055
1056         return ret;
1057 }
1058
1059 /*
1060  * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support.
1061  * Note this is not used for TCM/pSCSI passthrough
1062  */
1063 static int
1064 target_emulate_write_same(struct se_task *task, int write_same32)
1065 {
1066         struct se_cmd *cmd = task->task_se_cmd;
1067         struct se_device *dev = cmd->se_dev;
1068         sector_t range;
1069         sector_t lba = cmd->t_task_lba;
1070         unsigned int num_blocks;
1071         int ret;
1072         /*
1073          * Extract num_blocks from the WRITE_SAME_* CDB.  Then use the explict
1074          * range when non zero is supplied, otherwise calculate the remaining
1075          * range based on ->get_blocks() - starting LBA.
1076          */
1077         if (write_same32)
1078                 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
1079         else
1080                 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
1081
1082         if (num_blocks != 0)
1083                 range = num_blocks;
1084         else
1085                 range = (dev->transport->get_blocks(dev) - lba);
1086
1087         printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %llu\n",
1088                  (unsigned long long)lba, (unsigned long long)range);
1089
1090         ret = dev->transport->do_discard(dev, lba, range);
1091         if (ret < 0) {
1092                 printk(KERN_INFO "blkdev_issue_discard() failed for WRITE_SAME\n");
1093                 return ret;
1094         }
1095
1096         task->task_scsi_status = GOOD;
1097         transport_complete_task(task, 1);
1098         return 0;
1099 }
1100
1101 int
1102 transport_emulate_control_cdb(struct se_task *task)
1103 {
1104         struct se_cmd *cmd = task->task_se_cmd;
1105         struct se_device *dev = cmd->se_dev;
1106         unsigned short service_action;
1107         int ret = 0;
1108
1109         switch (cmd->t_task_cdb[0]) {
1110         case INQUIRY:
1111                 ret = target_emulate_inquiry(cmd);
1112                 break;
1113         case READ_CAPACITY:
1114                 ret = target_emulate_readcapacity(cmd);
1115                 break;
1116         case MODE_SENSE:
1117                 ret = target_emulate_modesense(cmd, 0);
1118                 break;
1119         case MODE_SENSE_10:
1120                 ret = target_emulate_modesense(cmd, 1);
1121                 break;
1122         case SERVICE_ACTION_IN:
1123                 switch (cmd->t_task_cdb[1] & 0x1f) {
1124                 case SAI_READ_CAPACITY_16:
1125                         ret = target_emulate_readcapacity_16(cmd);
1126                         break;
1127                 default:
1128                         printk(KERN_ERR "Unsupported SA: 0x%02x\n",
1129                                 cmd->t_task_cdb[1] & 0x1f);
1130                         return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1131                 }
1132                 break;
1133         case REQUEST_SENSE:
1134                 ret = target_emulate_request_sense(cmd);
1135                 break;
1136         case UNMAP:
1137                 if (!dev->transport->do_discard) {
1138                         printk(KERN_ERR "UNMAP emulation not supported for: %s\n",
1139                                         dev->transport->name);
1140                         return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1141                 }
1142                 ret = target_emulate_unmap(task);
1143                 break;
1144         case WRITE_SAME_16:
1145                 if (!dev->transport->do_discard) {
1146                         printk(KERN_ERR "WRITE_SAME_16 emulation not supported"
1147                                         " for: %s\n", dev->transport->name);
1148                         return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1149                 }
1150                 ret = target_emulate_write_same(task, 0);
1151                 break;
1152         case VARIABLE_LENGTH_CMD:
1153                 service_action =
1154                         get_unaligned_be16(&cmd->t_task_cdb[8]);
1155                 switch (service_action) {
1156                 case WRITE_SAME_32:
1157                         if (!dev->transport->do_discard) {
1158                                 printk(KERN_ERR "WRITE_SAME_32 SA emulation not"
1159                                         " supported for: %s\n",
1160                                         dev->transport->name);
1161                                 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1162                         }
1163                         ret = target_emulate_write_same(task, 1);
1164                         break;
1165                 default:
1166                         printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:"
1167                                         " 0x%02x\n", service_action);
1168                         break;
1169                 }
1170                 break;
1171         case SYNCHRONIZE_CACHE:
1172         case 0x91: /* SYNCHRONIZE_CACHE_16: */
1173                 if (!dev->transport->do_sync_cache) {
1174                         printk(KERN_ERR
1175                                 "SYNCHRONIZE_CACHE emulation not supported"
1176                                 " for: %s\n", dev->transport->name);
1177                         return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1178                 }
1179                 dev->transport->do_sync_cache(task);
1180                 break;
1181         case ALLOW_MEDIUM_REMOVAL:
1182         case ERASE:
1183         case REZERO_UNIT:
1184         case SEEK_10:
1185         case SPACE:
1186         case START_STOP:
1187         case TEST_UNIT_READY:
1188         case VERIFY:
1189         case WRITE_FILEMARKS:
1190                 break;
1191         default:
1192                 printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for %s\n",
1193                         cmd->t_task_cdb[0], dev->transport->name);
1194                 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
1195         }
1196
1197         if (ret < 0)
1198                 return ret;
1199         task->task_scsi_status = GOOD;
1200         transport_complete_task(task, 1);
1201
1202         return PYX_TRANSPORT_SENT_TO_TRANSPORT;
1203 }